MySQL

When doing ecshop encounter this problem, although seemingly simple, can write this SQL spend a lot of time Ah, do a save, nothing can see for yourselfUpdate ' gjmm20160612 '. ' Ecs_user_bonus ' as a set a.user_id=363534 where a.bonus_id =

InnoDB engine1. Innodb_buffer_pool_size Buffer index page, data page, undo page, insert buffer, Adaptive Hash index, INNODB stored lock information, digital dictionary information, etc.2.innodb_buffer_pool_instances allows multiple buffer pool

SELECT wle.*, Casewhen ' 2017-08-10 14:00:00 ' > Wle.et then ' Back ' when Wle.st >= ' 2017-08-10 14:00:00 ' and ' 2017-08-10 14:00:00 ' ' 2017-08-10 14:00:00 ' ' 2017-08-10 14:00:00 ' 　　Record a MySQL case when usage

Incremental backup and overall backup in system operationExample: Every Sunday overall backup, Monday to Saturday backup dayIf Friday is out of the question you can use the whole of Sunday plus Monday Tuesday Wednesday Thursday to recoverBackup

MySQL View connection number related information inDatabase: Information_schema table: ProcesslistThe table structure is as follows:Mysql>desc processlist;+---------+-------------+------+-----+---------+-------+| Field | Type | Null | Key | Default |

(1) The first case when creating a new database(2) The second case is that the configuration encoding in the IDE environment is set to UTF-8(3) The third case is when the database is connected, no encoding is set. This is the most conventional. This

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Redis cache mechanism [reprinted], redis cache reprinted Reprinted from: http://blog.csdn.net/acmman/article/details/53434134   Redis Master/Slave Mode(1) IntroductionRedis stores data in memory and runs faster than relational databases. It also has

Mysql error: Deadlock found when trying to get lock; try restarting transaction solution, deadlockrestarting Problems Found The program suddenly reported the following error when completing the previous data: [2017-02-10 13:12:06.678] [INFO]

How can I solve Mysql transaction operation failure? mysql transaction failure How to solve Mysql transaction operation failure Atomicity of transactions: a transaction is the logical unit of work in a database. All operations contained in a

Detailed description of special Mybatis characters, special mybatis characters Preface: Special Character Processing for Mybatis and special character processing for xml files in Mybatis. Solutions and examples are provided here. For details,

How to Use binlog2sql for fast rollback after Mysql misoperations, mysqlbinlog2sql Preface During daily work or study, operations on the database will inevitably result in incorrect operations due to "carelessness". If you need to recover quickly,

Mysql table, column, and database addition, deletion, modification, query, and mysql Summary Below are some basic SQL knowledge I have summarized, mainly to better check and help other beginners in the future, and to record their own growth, I also

Upgrade MySQL5.1 to 5.5.36 and centosmysql5.1 in CentOS Record the process of upgrading MySQL5.1 to 5.5.36 in the CentOS 6.4 environment. I hope you can have a reference. 1. For the sake of security, the original data must be backed up first. 2.

Install MySQL5.7.18 and mysql5.7.18 in Windows This article explains how to install MySQL from a compressed package. 1. Download the MySQL package, [Windows (x86, 64-bit), ZIP Archive ]; 2. decompress the Zip package to the desired directory, such

Django + mysql configuration and simple operation of database instance code, djangomysql Step 1: Download the mysql driver Run cmd to enter the created django project directory: Use the command pip install mysqlclient Wait until the installation is

MySQL keywords: Distinct Usage of MySQL keyword Distinct DDL Prepare SQL: create table test(id bigint not null primary key auto_increment, name varchar(10) not null, phone varchar(10) not null, email varchar(30) not null)engine=innodb; Prepare

MYSQL Log and Backup recovery problems, mysql Log Recovery details This article shares the MYSQL Log and backup and restoration for your reference. The specific content is as follows: I. Error Log When the database becomes unavailable due to any

Obtain the Top N and mysqltop for MySQL grouping and sorting. Obtain Top N for MySQL grouping and sorting Table Structure   Group by grp and sort by num. Top 3 is selected for each group. The output result is as follows:    Source code:

The InnoDB engine is disabled when MySQL is started. mysqlinnodb Problems Found When I copy table data from a local database to a database on CentOS 6.6, the following message is displayed: Unknown table engine 'InnoDB' So I checked the engine in